Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fe7d11b0c19788…

MALICIOUS

PDF

76.3 KB Created: 2021-03-16 18:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0164b36fa302d4dff92dd791eb003455 SHA-1: 48b5a2e02f4788cca063b15bbc8c13e06b567d03 SHA-256: 37fe7d11b0c19788d8f1277d842b9b32b28ea2c68bd9b50731f7793df7726ae4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/award?keyword=steel+furniture+design+catalog+pdf PDF link annotation
    • https://cdn.sqhk.co/suvotoruwot/jfTFhce/taxizodakedexaz.pdfIn PDF document text
    • http://creditscorehelp.info/how_to_build_strength_gymzxysi.pdfIn PDF document text
    • http://vnatural.space/behold_a_pale_horse_download989i6.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/chcJVjf/66144477465.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/92330096189.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_60007a7615d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_60457328daa03.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/vjhVTTP/hide_my_face_acid_ghost_testo.pdfIn PDF document text
    • http://spain50off.info/asfixia_alex_mirez_descargar_gratisjm0ea.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/ghihX9i/e-_pluribus_unum_coin_value_1971.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/wibTicw/69686606835.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/ji9hHib/nunuvosevozupogubega.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/beatles_yesterday_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/5hijhaX/78735386342.pdfIn PDF document text
    • https://cdn.sqhk.co/gifidupuzuv/i91iCik/98958147709.pdfIn PDF document text
    • http://vkrowl.com/what_is_the_balance_sheet_used_for7uu5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_603ef423539cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2d4b4c3f-e7cf-443e-b200-c27eae6bda74.filesusr.com/ugd/3b0c81_9865cf6c5cf34fc281345de6a4e0d69d.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_4010d7d23754488792c3a8b92b5c1266.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_533ad9270c424707a365f7383783e6e3.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_d8d0dd55f47b4c4fae1ce33416da67d1.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_637edbfbee8d4973bd69add0aa62195b.pdf?index=trueIn PDF document text
    • http://dijuvunote.onlinewebshop.net/employment_certificate_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 5308 bytes
SHA-256: bd8ea45c6bd92cca3ba8714055e6d503d706231b5db947911c36c7e3d8c99e7d
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10400 bytes
SHA-256: fe3015ea28293d85cfb3dd9cc1c6a6a07080782a1e4989f6d7f2b707e12e5c05
font_02_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176